class Container{
    static of(value){
        return new Container(value)
    }
    constructor(value){
        this._value = value
    }
    map(fn){
        return Container.of(fn(this._value))
    }
}
class Maybe{
    static of(x){
        return new Maybe(x)
    }
    isNothing(){
        return this._value ===null ||this._value ===undefined
    }
    constructor(x){
        this._value=x
    }
    map(fn){
        return this.isNothing()?this:Maybe.of(fn(this._value))
    }
}
module.exports = {Maybe,Container}